guide
The Benefits of Onion
Humble and present in almost every kitchen, the onion hides more than just flavour. Antioxidants, fibre for the gut, heart support: here is what we actually know, without overstating it.
In brief
The onion is one of the simplest and most accessible foods there is. It is rich in antioxidants, including the well known quercetin, and in fibre that feeds the good bacteria in the gut. The literature credits it with support for immunity and the heart. Cooked in soups, stews and tagines, it is the base of a whole cuisine. Nothing magical, just a good daily habit.
In tradition
The onion (البصل) has graced the tables of the Maghreb and the Levant for centuries. We find it in tagines, broths, Ramadan soups and marinades. In ancestral and prophetic cooking, it belonged to those simple, nourishing everyday foods shared without ceremony. It is named in the Quran among the plants of the earth that the people of Moses asked for. بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ. The Most High said: «وَفُومِهَا وَعَدَسِهَا وَبَصَلِهَا» (Surah Al-Baqarah, verse 61). The onion thus appears among the earthly foods people already knew and valued.
What science says
The onion is a good source of quercetin, an antioxidant of the flavonoid family, and of the sulphur compounds that give it its smell. It also brings prebiotic fibre, mainly fructans, which feed the good bacteria of the gut microbiome. The available work suggests a favourable effect on immunity and on certain cardiovascular markers such as blood pressure and the lipid profile. Let us stay honest: most of this data comes from observational studies or concentrated doses, and the onion remains a food, not a treatment. It fits into a varied diet, it does not replace one.
How to eat it
No complicated rule needed: half an onion to one onion a day, worked into your dishes, is plenty. Raw keeps more quercetin, but in the Tayyibat system the onion is eaten cooked, never raw. Gently cooked, it turns sweet and easy to digest, perfect for soups, slow simmered dishes, tagines and sautés. Preferably finely chopped or blended, it melts into the sauce. One tip: once chopped, let it rest ten minutes before cooking, which helps preserve its active compounds. Vary the colours too, red onion is even richer in antioxidants than white.
Precautions and for whom
For the great majority of people, the onion is a safe and healthy food. But in sensitive individuals, especially with irritable bowel syndrome, its fructans can cause bloating and gas: in that case, small well cooked amounts are better. Raw, it can cause heartburn or strong breath. People on blood thinners or before surgery should avoid eating large amounts and ask their doctor. For dogs and cats, the onion is toxic, never give it to them. In the Tayyibat system, the onion is kept cooked only, never raw. For the detail, see the onion page.
Frequently asked questions
Should onion be eaten raw or cooked? Raw keeps more quercetin and sulphur compounds, cooked is gentler on the stomach. The Tayyibat system keeps it cooked only, preferably finely chopped or blended into the sauce. Does onion really lower blood pressure? Some studies point that way, but the effect stays modest and replaces no treatment. Is red onion better than white? It holds a little more antioxidants, but both are good, take the one you prefer. This is informative and does not replace a doctor.
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This article relays the public teachings of Dr. Diaa Al-Awadi for educational and informative purposes. It is not medical advice. Consult your physician before any dietary change. Legal notice.